package com.example.coolweather;

import android.app.ProgressDialog;
import android.content.Intent;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.Fragment;

import com.example.coolweather.db.City;
import com.example.coolweather.db.County;
import com.example.coolweather.db.Province;
import com.example.coolweather.gson.Weather;
import com.example.coolweather.util.HttpUtil;
import com.example.coolweather.util.Utility;

import org.jetbrains.annotations.NotNull;
import org.litepal.crud.DataSupport;

import java.io.IOException;
import java.util.ArrayList;
import java.util.List;

import okhttp3.Call;
import okhttp3.Callback;
import okhttp3.Response;

/**
 * create: 2021.5.14
 * author: starve_to_death
 * 遍历省市县数据的碎片
 */
public class ChooseAreaFragment extends Fragment {
    public static final int LEVEL_PROVINCE = 0;

    public static final int LEVEL_CITY = 1;

    public static final int LEVEL_COUNTY = 2;

    private ProgressDialog progressDialog;

    private TextView titleText;

    private Button backButton;

    private ListView listView;

    private ArrayAdapter<String> adapter;

    private List<String> dataList = new ArrayList<>();

    private List<Province> provinceList; // 省列表

    private List<City> cityList; // 市列表

    private List<County> countyList; // 县列表

    private Province selectedProvince; // 选中的省份

    private City selectedCity; // 选中的城市

    private County selectedCounty; // 选中的县

    private int currentLevel; // 当前选中的级别

    /**
     * 在Fragment布局显示的时候才会被调用
     * @param inflater
     * @param container
     * @param savedInstanceState
     * @return
     */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.choose_area, container, false);
        titleText = (TextView) view.findViewById(R.id.title_text);
        backButton = (Button) view.findViewById(R.id.back_button);
        listView = (ListView) view.findViewById(R.id.list_view);
        adapter = new ArrayAdapter<>(getContext(), android.R.layout.simple_list_item_1, dataList);
        listView.setAdapter(adapter);
        return view;
    }

    /**
     * 执行时机：每次创建、绘制该Fragment的View组件时回调该方法
     * @param savedInstanceState
     */
    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
        /**
         * 当点击某个item时会被调用
         */
        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                if (currentLevel == LEVEL_PROVINCE){
                    selectedProvince = provinceList.get(i);
                    queryCities();
                } else if(currentLevel == LEVEL_CITY){
                    selectedCity = cityList.get(i);
                    queryCounties();
                } else if(currentLevel == LEVEL_COUNTY){// 从县列表界面跳转到天气界面
                    String weatherId = countyList.get(i).getWeatherId();
                    if(getActivity() instanceof  MainActivity){
                        Intent intent = new Intent(getActivity(), WeatherActivity.class);
                        intent.putExtra("weather_id", weatherId);
                        startActivity(intent);// 启动WeatherActivity
                        getActivity().finish();
                    }
                    else if(getActivity() instanceof WeatherActivity){
                        WeatherActivity activity = (WeatherActivity) getActivity();
                        activity.drawerLayout.closeDrawers();//关闭菜单
                        activity.swipeRefresh.setRefreshing(true);//显示下拉进度条
                        activity.requestWeather(weatherId);
                    }
                }
            }
        });
        backButton.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                if (currentLevel == LEVEL_COUNTY){
                    queryCities();
                } else if(currentLevel == LEVEL_CITY){
                    queryProvinces();
                }
            }
        });
        queryProvinces(); // 从这里开始加载省级数据的
    }

    /**
     *  查询全国所有的省，优先从数据库查询，如果没有查询到再去服务器上查询
     */
    private void queryProvinces() {
        titleText.setText("中国");
        backButton.setVisibility(View.GONE);// 将返回键隐藏起来，因为省级已经没有上一层了
        provinceList = DataSupport.findAll(Province.class);// 调用LitePal的查询接口来从数据库中读取省级数据
        if(provinceList.size() > 0){
            dataList.clear();
            for (Province province : provinceList) {
                dataList.add(province.getProvinceName());
            }
            adapter.notifyDataSetChanged();// 数据源改变时，刷新ListView
            listView.setSelection(0);// 从第0个item为“顶”显示
            currentLevel = LEVEL_PROVINCE;
        } else {
            String address = "https://lbsyun.baidu.com/index.php?title=car/api/weather";
            queryFromServer(address, "currentCity");
        }
    }

    /**
     *  查询选中省内所有的市，优先从数据库查询，如果没有查询到再去服务器上查询
     */
    private void queryCities() {
        titleText.setText(selectedProvince.getProvinceName());
        backButton.setVisibility(View.VISIBLE);
        cityList = DataSupport.where("provinceid = ?", String.valueOf(selectedProvince.getId())).find(City.class);
        if(cityList.size() > 0){
            dataList.clear();
            for(City city : cityList){
                dataList.add(city.getCityName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel = LEVEL_CITY;
        } else{
            int provinceCode = selectedProvince.getProvinceCode();
            String address = "https://lbsyun.baidu.com/index.php?title=car/api/weather" + provinceCode;
            queryFromServer(address, "currentCity");
        }
    }

    /**
     *  查询选中市内所有的县，优先从数据库查询，如果没有查询到再去服务器上查询
     */
    private void queryCounties() {
        titleText.setText(selectedCity.getCityName());
        backButton.setVisibility(View.VISIBLE);
        countyList = DataSupport.where("currentCityid = ?", String.valueOf(selectedCity.getId())).find(County.class);
        if(countyList.size() > 0){
            dataList.clear();
            for(County county : countyList){
                dataList.add(county.getCountyName());
            }
            adapter.notifyDataSetChanged();
            listView.setSelection(0);
            currentLevel = LEVEL_COUNTY;
        } else {
            int provinceCode = selectedProvince.getProvinceCode();
            int cityCode = selectedCity.getCityCode();
            String address = "https://lbsyun.baidu.com/index.php?title=car/api/weather" + provinceCode + "/" + cityCode;
            queryFromServer(address, "county");
        }
    }

    /**
     * 根据传入的地址和类型从服务器上查询省市县数据
     * @param address
     * @param type
     */
    private void queryFromServer(String address, String type) {
        showProgressDialog();
        HttpUtil.sendOkHttpRequest(address, new Callback() {
            @Override
            public void onFailure(@NotNull Call call, @NotNull IOException e) {
                // 通过runOnUiThread()方法回到主线程处理
                getActivity().runOnUiThread(new Runnable() {
                    @Override
                    public void run() {
                        closeProgressDialog();
                        Toast.makeText(getContext(), "加载失败", Toast.LENGTH_SHORT).show();
                    }
                });
            }

            @Override
            public void onResponse(@NotNull Call call, @NotNull Response response) throws IOException {
                String responseText = response.body().string();
                boolean result = false;
                if("province".equals(type)){
                    result = Utility.handleProvinceResponse(responseText);
                } else if("City".equals(type)){
                    result = Utility.handleCityResponse(responseText, selectedProvince.getId());
                } else if("county".equals(type)){
                    result = Utility.handleCountyResponse(responseText, selectedCity.getId());
                }
                if(result){
                    // 因为queryProvinces()方法牵扯到了UI操作，必须在主线程中完成，由此方法切换回主线程
                    getActivity().runOnUiThread(new Runnable() {
                        @Override
                        public void run() {
                            closeProgressDialog();
                            if("province".equals(type)){
                                queryProvinces();
                            } else if("City".equals(type)){
                                queryCities();
                            } else if("county".equals(type)){
                                queryCounties();
                            }
                        }
                    });
                }
            }
        });
    }

    /**
     *  显示进度对话框
     */
    private void showProgressDialog() {
        if(progressDialog == null){
            progressDialog = new ProgressDialog(getActivity());
            progressDialog.setMessage("正在加载");
            progressDialog.setCanceledOnTouchOutside(false);
        }
    }

    /**
     *  关闭进度对话框
     */
    private void closeProgressDialog() {
        if(progressDialog != null){
            progressDialog.dismiss();
        }
    }


}
